alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET TROJAN Win32/Valak - Stage 2 - Request"; flow:established,to_server; content:"GET"; http_method; urilen:>60; content:"_aWQ9"; http_uri; fast_pattern; content:".html"; http_uri; distance:0; isdataat:!1,relative; pcre:"/_aWQ9[a-zA-Z0-9\/]{43,46}(JmdpZD?|Z2lkP|ZnaWQ9)/U"; http_header_names; content:!"Referer"; metadata: former_category MALWARE; reference:md5,c254b4f261a6f426c282ed8858a7bee0; reference:url,medium.com/@prsecurity_/casual-analysis-of-valak-c2-3497fdb79bf7; classtype:trojan-activity; sid:2029193; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, deployment Perimeter, signature_severity Major, created_at 2019_10_22, performance_impact Moderate, updated_at 2019_12_23;)

Added 2019-12-23 19:12:44 UTC


Topic revision: r1 - 2019-12-24 - TWikiGuest
 
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